Answer:
8.6 m/s
Explanation:
The components of the initial velocity of the ball can be found by using the equations:

where
is the horizontal component
is the vertical component
v is the magnitude of the velocity
is the angle above the horizontal
Substituting:
v = 15 m/s

We find:

The perfect elastic Collision ball will hit the door first because the clay is heavier and will take more time
Answer:
I think it may be decreased, but i'm in 6th grade so-
Explanation:
Galileo Galilei is one of the key figures in the history of Science, being the first to apply the experimental-mathematical scientific method. He carried out experiments and careful observations in kinematics (his studies on the trajectory of projectiles are famous) and dynamics (it should be noted his careful experiments with inclined planes), establishing the first law of Dynamics (which Newton will later collect and refine in his Principles); and in Astronomy, with which he could unequivocally support the heliocentric theory.
His experiments were addressed by methodologies that allowed him to precisely find his mathematical calculations and to verify theories he was developing over time. His manuscripts were key to disseminate the applied method and extrapolate them to other scientific areas.
Therefore the correct answer is C.